Disallow re-joining, see #2873

* Disallow join requests when already part of a cluster
* Remove wipe state when joining, since join can only be
  performed from empty state
* When trying to join, only accept gossip from that member
* Ignore gossips from unknown (and unreachable) members
* Make sure received gossip contains selfAddress
* Test join of fresh node with same host:port
* Remove JoinTwoClustersSpec
* Welcome message as reply to Join
* Retry unsucessful join request
* AddressUidExtension
* Uid in cluster Member identifier
  To be able to distinguish nodes with same host:port
  after restart.
* Ignore gossip with wrong uid
* Renamed Remove command to Shutdown
* Use uid in vclock identifier
* Update sample, Member apply is private
* Disabled config duration syntax and cleanup of io settings
* Update documentation

akka-cluster/src/test/scala/akka/cluster/ClusterConfigSpec.scala

@@ -25,6 +25,7 @@ class ClusterConfigSpec extends AkkaSpec {
       FailureDetectorImplementationClass must be(classOf[PhiAccrualFailureDetector].getName)
       SeedNodes must be(Seq.empty[String])
       SeedNodeTimeout must be(5 seconds)
+      RetryUnsuccessfulJoinAfter must be(10 seconds)
       PeriodicTasksInitialDelay must be(1 seconds)
       GossipInterval must be(1 second)
       HeartbeatInterval must be(1 second)